Electrochemical determination of 4-nitrophenol in environmental water samples using porous graphitic carbon
Manikandan Ramalingam1, Vinoth Kumar Ponnusamy2,3, Sriman Narayanan Sangilimuthu4
1Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung City, 807, Taiwan, Republic of China.
Abstract:
We demonstrate a facile preparation of novel oxidized graphitic carbon nitride (O-gC3N4) applied as an efficient electrocatalyst for highly sensitive electrochemical detection of 4-nitrophenol (4-NP) in environmental water samples. As-prepared O-gC3N4 were characterized by attenuated total reflection infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction methods for the confirmation of different functional groups and structural phase of O-gC3N4. The surface morphology of the O-gC3N4 was characterized using field emission scanning electron microscopy and high-resolution transmission electron microscopy. Results revealed that the synthesized gC3N4 possessed acid functional groups, nanosheet with porous in nature. The O-gC3N4 was drop cast on the screen-printed electrode (SPE), and it was applied for electrochemical determination of 4-NP using cyclic voltammetry and differential pulse voltammetry (DPV) techniques. The O-gC3N4/SPE exhibited excellent electrocatalytic activity towards 4-NP detection. Under the optimized experimental conditions, the DPV response of O-gC3N4/SPE showed good linear range from 0.0033 to 0.313 μM with a detection limit (S/N = 3) of 0.075 μM. The developed electrode has successfully applied for the determination of 4-NP in different environmental water samples, and the results have shown satisfied.
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